[reactjs] Axios get in url works but with second parameter as object it doesn't

I'm trying to send GET request as second parameter but it doesn't work while it does as url.

This works, $_GET['naam'] returns test:

export function saveScore(naam, score) {
  return function (dispatch) { 
    axios.get('http://****.nl/****/gebruikerOpslaan.php?naam=test')
      .then((response) => {
        dispatch({type: "SAVE_SCORE_SUCCESS", payload: response.data})
      })
      .catch((err) => {
        dispatch({type: "SAVE_SCORE_FAILURE", payload: err})
      })
  }
};

But when I try this, there is nothing in $_GET at all:

export function saveScore(naam, score) {
  return function (dispatch) { 
    axios.get('http://****.nl/****/gebruikerOpslaan.php',
    {
        password: 'pass',
        naam: naam,
        score: score
    })
      .then((response) => {
        dispatch({type: "SAVE_SCORE_SUCCESS", payload: response.data})
      })
      .catch((err) => {
        dispatch({type: "SAVE_SCORE_FAILURE", payload: err})
      })
  }
};

Why can't I do that? In the docs it clearly says it's possible. With $_POST it doesn't work either.

On client:

  axios.get('/api', {
      params: {
        foo: 'bar'
      }
    });

On server:

function get(req, res, next) {

  let param = req.query.foo
   .....
}